import React, { Component } from 'react'
import './index.css'
export default class index extends Component {
    handleCheckAll = (event) => {
        this.props.checkAll(event.target.checked);
    }

    handleClearDoneAll = () => {
        this.props.clearDoneAll()
    }

    render() {
        const { todos } = this.props
        const doneCount = todos.reduce((pre, current) => { return pre + (current.done ? 1 : 0) }, 0)
        const total = todos.length

        return (
            <div className="todo-footer" >
                <label>
                    <input type="checkbox" checked={doneCount === total && total !== 0 ? true : false} onChange={this.handleCheckAll} />
                </label>
                <span>
                    <span>已完成{doneCount}</span> / 全部{total}
                </span>
                <button className="btn btn-danger" onClick={this.handleClearDoneAll}>清除已完成任务</button>
            </div>
        )
    }
}
